Why is it recommended to use an array based on a slice in Go?

In Go, it is recommended to use an array based on a slice because slices are a more flexible and convenient data structure than arrays. Slices allow dynamic resizing, whereas arrays have a fixed length.

By creating an array based on a slice, you can obtain a base array that will be used to store data, while slices provide convenient access and management of this data. This helps to efficiently manage memory and avoid unnecessary copying.

Example:

// Create a slice with length 5
slice := make([]int, 5)

// underlyingArray is the array on which the slice is based
underlyingArray := slice[:]

// You can work with underlyingArray as a fixed-length array

Thus, the array serves as the base, and the slice is a convenient interface for working with the data.